Is Linalool Safe in Perfume?

Pure, fresh linalool is a weak allergen. The risk comes from oxidation: when linalool is exposed to air over time it forms hydroperoxides, which are significantly more sensitising. This is why older or poorly-stored fragrances can cause reactions that a fresh bottle would not.

Linalool in the concentrations used in finished perfume is considered safe during pregnancy. There is no evidence of reproductive toxicity at fragrance-use levels. As with all fragrance, those with heightened pregnancy sensitivity may simply find the scent unpleasant rather than unsafe.

If you have a known fragrance allergy or eczema, linalool is one of the more common triggers, but usually only its oxidised form. Choose freshly-purchased fragrances, store them away from heat and light, and patch-test on the inner forearm before full application.